New Zealand Freshwater Fish

DSC_3304 Rainbow trout (Oncorhynchus mykiss) genetic variants are extremely rare in wild rainbow trout, but they occasionally appear in hatchery raised fish. These may be either 'depigmented' (such as albino, or golden yellow), or 'blue' (either iridescent metallic blue, or cobalt blue). Such mutations are usually sterile in both sexes because of the lack of a large part of the pituitary gland. Ngongataha Hatchery *